It is going to be very difficult for Sutherland Springs to overcome the tragedy, Rep. Henry Cuellar, whose district includes the town where the massacre at the church took place, told MSNBC's "Morning Joe" on Monday.

Twenty-six people were killed and some 20 more injured when a gunman entered the town's First Baptist Church on Sunday and opened fire with an assault rifle.

The Democratic congressman described Sutherland Springs as "a very close-knitted community… of less than 400 individuals [where] everybody there knows every single person that got killed or got injured there."

Cuellar said he has been in contact with the sheriff, whom he has known for more than 13 years, and that the congressman's staff is in the town to provide "assistance and resources and whatever we can do to provide healing to this community."

"It's going to be a difficult time to go through this grieving process, and then go through this healing process," Cuellar said. "The question is why us? Why here at a house of worship?"

The congressman said that he heard about the massacre when he received a call from his staff and then called the sheriff to get a report on the details of what happened.

The investigation is "going to be ongoing [and] I have to say that the federal, state and local law enforcement have all been working together as a team," Cuellar said.

It is going to be very difficult for Sutherland Springs to overcome the tragedy, Rep. Henry Cuellar, whose district includes the town where the massacre at the church took place, told MSNBC's "Morning Joe" on Monday.